Spoiler alert! Francesca Reale is an excellent cookie decorator. She stopped by the Allrecipes studio to put her "Stranger Things" character Heather Holloway in cookie form. She even decorated one for the Mind Flayer — the ultimate baddie from The Upside Down — which involved a lot of black icing and black string licorice, naturally.

While she shaped cookie faces, Reale shared behind-the-scenes takes on her costars and how she shot some tricky scenes in Season 3 — and whether she thinks Heather can make a comeback. Plus, she talked about a new film she made with her "Stranger Things" costar Natalia Dyer.

Watch this episode of "Treat Yourself" and many more on Allrecipes Twitter.

Binge Season 3 of "Stranger Things" on Netflix.

Learn how to make the best sugar cookies, and pick from our top-rated sugar cookie recipes to make your own cookie self-portrait.

These easy tips to decorate sugar cookies guarantee your cookie self-portraits will be camera-ready.